$72+10\left(7.2\right)$
$7,09\cdot18,32$
$\left(a^2+3a+2\right)\left(a+1\right)$
$\frac{1}{8}^{24}$
$\frac{x^{2}+4x-5}{x^{2}-2x+1}\times\frac{x^{2}-1}{x^{2}+5x}$
$\frac{1m}{2}$
$\frac{2}{-5}=\frac{6}{x}$
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